Question

Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.

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Linked Question 1

Bleaching powder contains a salt of an oxoacid as one its components. The anhydride of that oxoacid is:

Cl₂O₇

Cl₂O

Cl₂O₆

ClO₂

Bleaching powder is Ca(OCl)Cl

Cl₂O is anhydride of HOCl

Cl₂O + H₂O $\to_{}^{}$ 2HOCl

Linked Question 2

25 mL of household bleach solution was mixed with 30 mL of 0.50 M KI and 10 mL of 4N acetic acid. In the titration of the liberated iodine, 48 mL of 0.25 N Na₂S₂O₃ was used to reach the end point. The molarity of the household bleach solution is :

0.24 M

0.96 M

0.024 M

0.48 M

OCl¯ + I¯ $\to_{}^{}$ Cl¯ + I₂

(From bleaching powder)

I₂ + S₂O₃^2– $\to_{}^{}$ I¯ + S₄O₆^2–

n_eq bleaching = n_eq S₂O₃^2–

$or, \frac{25 \times (S \times 2)}{1000} = \frac{48 \times 0 .25}{1000}$

$∴$ S = 0.24 M